Turns out that there is in fact a list of sorts.
There were some days that the server was unavailable, and the domain was added to this list.
The point of the list is unclear, but there is a list.

-----Original Message----- From: Marcin Cieslak
Sent: Thursday, September 10, 2015 3:11 PM
To: Todd K Grand
Cc: nanog list
Subject: Re: outlook.com outgoing blacklists?

On Thu, 10 Sep 2015, Todd K Grand wrote:

The problem has been resolved.
Thanks to everybody that contributed.

And the issue was...?

~Marcin

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